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AR-10/LR-308 rifle owners know the importance of a clean bolt and bolt carrier group. Carbon and fouling can build-up in these areas, causing jams and malfunctions. The Otis BONE Tool was designed specifically to clean the bolt carrier assembly area of .308 Win/7.62x51mm NATO rifles (bolt, carrier, and firing pin). Threaded hole is 8-32. Can also act as a T-handle.